A112261 a(n) = A112260(n+1) - A112260(n).

-2, 0, 12, 20, -12, -60, 52, 420, 468, -700, -1548, 3300, 13588, 8580, -29388, -30940, 152148, 406980, 60532, -1043100, -236652, 6032900, 11173812, -4569180, -32487212, 19343940, 216401652, 273243620, -323927532, -880031100, 1489420852, 7157028900

Offset: 1

Author

Russell Walsmith, Aug 30 2005

Keywords

• sign

Examples

			a(4) = A112260(5) - A112260(4) = 31-11 = 20.
		

Links

• Index entries for linear recurrences with constant coefficients, signature (3,-6,8).

Crossrefs

Cf. A112259, A112260.

Formula

a(n) = 3*a(n-1)-6*a(n-2)+8*a(n-3); G.f.: -2*(3*x-1) / ((2*x-1)*(4*x^2-x+1)). - Colin Barker, Nov 02 2014

Extensions

Name corrected and more terms from Colin Barker, Nov 02 2014